Insulating Synergy, heat control coating, clear insulatingglass unit to a close looking. Especially designed for winter conditions and the housing units INSULATING SYNERGY, the winters are very cold days in areas "passive solar gains"to ensure maximum benefit from the 3 on the surface,winter and summer conditions in temperate climate zones2 to provide optimum benefit balance used on the surface  

Solar Low-e
Insulating solar extreme heat of the sun visible in silver